arch/x86/boot/compressed/eboot.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 /* -----------------------------------------------------------------------
   4  *
   5  *   Copyright 2011 Intel Corporation; author Matt Fleming
   6  *
   7  * ----------------------------------------------------------------------- */
   8
   9 #pragma GCC visibility push(hidden)
  10
  11 #include <linux/efi.h>
  12 #include <linux/pci.h>
  13
  14 #include <asm/efi.h>
  15 #include <asm/e820/types.h>
  16 #include <asm/setup.h>
  17 #include <asm/desc.h>
  18 #include <asm/boot.h>
  19
  20 #include "../string.h"
  21 #include "eboot.h"
  22
  23 static efi_system_table_t *sys_table;
  24 extern const bool efi_is64;
  25
  26 __pure efi_system_table_t *efi_system_table(void)
  27 {
  28         return sys_table;
  29 }
  30
  31 __attribute_const__ bool efi_is_64bit(void)
  32 {
  33         if (IS_ENABLED(CONFIG_EFI_MIXED))
  34                 return efi_is64;
  35         return IS_ENABLED(CONFIG_X86_64);
  36 }
  37
  38 static efi_status_t
  39 preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
  40 {
  41         struct pci_setup_rom *rom = NULL;
  42         efi_status_t status;
  43         unsigned long size;
  44         uint64_t romsize;
  45         void *romimage;
  46
  47         /*
  48          * Some firmware images contain EFI function pointers at the place where
  49          * the romimage and romsize fields are supposed to be. Typically the EFI
  50          * code is mapped at high addresses, translating to an unrealistically
  51          * large romsize. The UEFI spec limits the size of option ROMs to 16
  52          * MiB so we reject any ROMs over 16 MiB in size to catch this.
  53          */
  54         romimage = efi_table_attr(pci, romimage);
  55         romsize = efi_table_attr(pci, romsize);
  56         if (!romimage || !romsize || romsize > SZ_16M)
  57                 return EFI_INVALID_PARAMETER;
  58
  59         size = romsize + sizeof(*rom);
  60
  61         status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
  62                              (void **)&rom);
  63         if (status != EFI_SUCCESS) {
  64                 efi_printk("Failed to allocate memory for 'rom'\n");
  65                 return status;
  66         }
  67
  68         memset(rom, 0, sizeof(*rom));
  69
  70         rom->data.type  = SETUP_PCI;
  71         rom->data.len   = size - sizeof(struct setup_data);
  72         rom->data.next  = 0;
  73         rom->pcilen     = pci->romsize;
  74         *__rom = rom;
  75
  76         status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
  77                                 PCI_VENDOR_ID, 1, &rom->vendor);
  78
  79         if (status != EFI_SUCCESS) {
  80                 efi_printk("Failed to read rom->vendor\n");
  81                 goto free_struct;
  82         }
  83
  84         status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
  85                                 PCI_DEVICE_ID, 1, &rom->devid);
  86
  87         if (status != EFI_SUCCESS) {
  88                 efi_printk("Failed to read rom->devid\n");
  89                 goto free_struct;
  90         }
  91
  92         status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus,
  93                                 &rom->device, &rom->function);
  94
  95         if (status != EFI_SUCCESS)
  96                 goto free_struct;
  97
  98         memcpy(rom->romdata, romimage, romsize);
  99         return status;
 100
 101 free_struct:
 102         efi_bs_call(free_pool, rom);
 103         return status;
 104 }
 105
 106 /*
 107  * There's no way to return an informative status from this function,
 108  * because any analysis (and printing of error messages) needs to be
 109  * done directly at the EFI function call-site.
 110  *
 111  * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
 112  * just didn't find any PCI devices, but there's no way to tell outside
 113  * the context of the call.
 114  */
 115 static void setup_efi_pci(struct boot_params *params)
 116 {
 117         efi_status_t status;
 118         void **pci_handle = NULL;
 119         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 120         unsigned long size = 0;
 121         struct setup_data *data;
 122         efi_handle_t h;
 123         int i;
 124
 125         status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
 126                              &pci_proto, NULL, &size, pci_handle);
 127
 128         if (status == EFI_BUFFER_TOO_SMALL) {
 129                 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
 130                                      (void **)&pci_handle);
 131
 132                 if (status != EFI_SUCCESS) {
 133                         efi_printk("Failed to allocate memory for 'pci_handle'\n");
 134                         return;
 135                 }
 136
 137                 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
 138                                      &pci_proto, NULL, &size, pci_handle);
 139         }
 140
 141         if (status != EFI_SUCCESS)
 142                 goto free_handle;
 143
 144         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 145
 146         while (data && data->next)
 147                 data = (struct setup_data *)(unsigned long)data->next;
 148
 149         for_each_efi_handle(h, pci_handle, size, i) {
 150                 efi_pci_io_protocol_t *pci = NULL;
 151                 struct pci_setup_rom *rom;
 152
 153                 status = efi_bs_call(handle_protocol, h, &pci_proto,
 154                                      (void **)&pci);
 155                 if (status != EFI_SUCCESS || !pci)
 156                         continue;
 157
 158                 status = preserve_pci_rom_image(pci, &rom);
 159                 if (status != EFI_SUCCESS)
 160                         continue;
 161
 162                 if (data)
 163                         data->next = (unsigned long)rom;
 164                 else
 165                         params->hdr.setup_data = (unsigned long)rom;
 166
 167                 data = (struct setup_data *)rom;
 168         }
 169
 170 free_handle:
 171         efi_bs_call(free_pool, pci_handle);
 172 }
 173
 174 static void retrieve_apple_device_properties(struct boot_params *boot_params)
 175 {
 176         efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID;
 177         struct setup_data *data, *new;
 178         efi_status_t status;
 179         u32 size = 0;
 180         apple_properties_protocol_t *p;
 181
 182         status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p);
 183         if (status != EFI_SUCCESS)
 184                 return;
 185
 186         if (efi_table_attr(p, version) != 0x10000) {
 187                 efi_printk("Unsupported properties proto version\n");
 188                 return;
 189         }
 190
 191         efi_call_proto(p, get_all, NULL, &size);
 192         if (!size)
 193                 return;
 194
 195         do {
 196                 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
 197                                      size + sizeof(struct setup_data),
 198                                      (void **)&new);
 199                 if (status != EFI_SUCCESS) {
 200                         efi_printk("Failed to allocate memory for 'properties'\n");
 201                         return;
 202                 }
 203
 204                 status = efi_call_proto(p, get_all, new->data, &size);
 205
 206                 if (status == EFI_BUFFER_TOO_SMALL)
 207                         efi_bs_call(free_pool, new);
 208         } while (status == EFI_BUFFER_TOO_SMALL);
 209
 210         new->type = SETUP_APPLE_PROPERTIES;
 211         new->len  = size;
 212         new->next = 0;
 213
 214         data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
 215         if (!data) {
 216                 boot_params->hdr.setup_data = (unsigned long)new;
 217         } else {
 218                 while (data->next)
 219                         data = (struct setup_data *)(unsigned long)data->next;
 220                 data->next = (unsigned long)new;
 221         }
 222 }
 223
 224 static const efi_char16_t apple[] = L"Apple";
 225
 226 static void setup_quirks(struct boot_params *boot_params)
 227 {
 228         efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
 229                 efi_table_attr(efi_system_table(), fw_vendor);
 230
 231         if (!memcmp(fw_vendor, apple, sizeof(apple))) {
 232                 if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
 233                         retrieve_apple_device_properties(boot_params);
 234         }
 235 }
 236
 237 /*
 238  * See if we have Universal Graphics Adapter (UGA) protocol
 239  */
 240 static efi_status_t
 241 setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size)
 242 {
 243         efi_status_t status;
 244         u32 width, height;
 245         void **uga_handle = NULL;
 246         efi_uga_draw_protocol_t *uga = NULL, *first_uga;
 247         efi_handle_t handle;
 248         int i;
 249
 250         status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
 251                              (void **)&uga_handle);
 252         if (status != EFI_SUCCESS)
 253                 return status;
 254
 255         status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
 256                              uga_proto, NULL, &size, uga_handle);
 257         if (status != EFI_SUCCESS)
 258                 goto free_handle;
 259
 260         height = 0;
 261         width = 0;
 262
 263         first_uga = NULL;
 264         for_each_efi_handle(handle, uga_handle, size, i) {
 265                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
 266                 u32 w, h, depth, refresh;
 267                 void *pciio;
 268
 269                 status = efi_bs_call(handle_protocol, handle, uga_proto,
 270                                      (void **)&uga);
 271                 if (status != EFI_SUCCESS)
 272                         continue;
 273
 274                 pciio = NULL;
 275                 efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio);
 276
 277                 status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh);
 278                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
 279                         width = w;
 280                         height = h;
 281
 282                         /*
 283                          * Once we've found a UGA supporting PCIIO,
 284                          * don't bother looking any further.
 285                          */
 286                         if (pciio)
 287                                 break;
 288
 289                         first_uga = uga;
 290                 }
 291         }
 292
 293         if (!width && !height)
 294                 goto free_handle;
 295
 296         /* EFI framebuffer */
 297         si->orig_video_isVGA    = VIDEO_TYPE_EFI;
 298
 299         si->lfb_depth           = 32;
 300         si->lfb_width           = width;
 301         si->lfb_height          = height;
 302
 303         si->red_size            = 8;
 304         si->red_pos             = 16;
 305         si->green_size          = 8;
 306         si->green_pos           = 8;
 307         si->blue_size           = 8;
 308         si->blue_pos            = 0;
 309         si->rsvd_size           = 8;
 310         si->rsvd_pos            = 24;
 311
 312 free_handle:
 313         efi_bs_call(free_pool, uga_handle);
 314
 315         return status;
 316 }
 317
 318 static void setup_graphics(struct boot_params *boot_params)
 319 {
 320         efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
 321         struct screen_info *si;
 322         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 323         efi_status_t status;
 324         unsigned long size;
 325         void **gop_handle = NULL;
 326         void **uga_handle = NULL;
 327
 328         si = &boot_params->screen_info;
 329         memset(si, 0, sizeof(*si));
 330
 331         size = 0;
 332         status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
 333                              &graphics_proto, NULL, &size, gop_handle);
 334         if (status == EFI_BUFFER_TOO_SMALL)
 335                 status = efi_setup_gop(si, &graphics_proto, size);
 336
 337         if (status != EFI_SUCCESS) {
 338                 size = 0;
 339                 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
 340                                      &uga_proto, NULL, &size, uga_handle);
 341                 if (status == EFI_BUFFER_TOO_SMALL)
 342                         setup_uga(si, &uga_proto, size);
 343         }
 344 }
 345
 346 void startup_32(struct boot_params *boot_params);
 347
 348 void __noreturn efi_stub_entry(efi_handle_t handle,
 349                                efi_system_table_t *sys_table_arg,
 350                                struct boot_params *boot_params);
 351
 352 /*
 353  * Because the x86 boot code expects to be passed a boot_params we
 354  * need to create one ourselves (usually the bootloader would create
 355  * one for us).
 356  */
 357 efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
 358                                    efi_system_table_t *sys_table_arg)
 359 {
 360         struct boot_params *boot_params;
 361         struct setup_header *hdr;
 362         efi_loaded_image_t *image;
 363         efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
 364         int options_size = 0;
 365         efi_status_t status;
 366         char *cmdline_ptr;
 367         unsigned long ramdisk_addr;
 368         unsigned long ramdisk_size;
 369
 370         sys_table = sys_table_arg;
 371
 372         /* Check if we were booted by the EFI firmware */
 373         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 374                 return EFI_INVALID_PARAMETER;
 375
 376         status = efi_bs_call(handle_protocol, handle, &proto, (void *)&image);
 377         if (status != EFI_SUCCESS) {
 378                 efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
 379                 return status;
 380         }
 381
 382         status = efi_low_alloc(0x4000, 1, (unsigned long *)&boot_params);
 383         if (status != EFI_SUCCESS) {
 384                 efi_printk("Failed to allocate lowmem for boot params\n");
 385                 return status;
 386         }
 387
 388         memset(boot_params, 0x0, 0x4000);
 389
 390         hdr = &boot_params->hdr;
 391
 392         /* Copy the second sector to boot_params */
 393         memcpy(&hdr->jump, image->image_base + 512, 512);
 394
 395         /*
 396          * Fill out some of the header fields ourselves because the
 397          * EFI firmware loader doesn't load the first sector.
 398          */
 399         hdr->root_flags = 1;
 400         hdr->vid_mode   = 0xffff;
 401         hdr->boot_flag  = 0xAA55;
 402
 403         hdr->type_of_loader = 0x21;
 404
 405         /* Convert unicode cmdline to ascii */
 406         cmdline_ptr = efi_convert_cmdline(image, &options_size);
 407         if (!cmdline_ptr)
 408                 goto fail;
 409
 410         hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
 411         /* Fill in upper bits of command line address, NOP on 32 bit  */
 412         boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
 413
 414         hdr->ramdisk_image = 0;
 415         hdr->ramdisk_size = 0;
 416
 417         status = efi_parse_options(cmdline_ptr);
 418         if (status != EFI_SUCCESS)
 419                 goto fail2;
 420
 421         status = handle_cmdline_files(image,
 422                                       (char *)(unsigned long)hdr->cmd_line_ptr,
 423                                       "initrd=", hdr->initrd_addr_max,
 424                                       &ramdisk_addr, &ramdisk_size);
 425
 426         if (status != EFI_SUCCESS &&
 427             hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
 428                 efi_printk("Trying to load files to higher address\n");
 429                 status = handle_cmdline_files(image,
 430                                       (char *)(unsigned long)hdr->cmd_line_ptr,
 431                                       "initrd=", -1UL,
 432                                       &ramdisk_addr, &ramdisk_size);
 433         }
 434
 435         if (status != EFI_SUCCESS)
 436                 goto fail2;
 437         hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
 438         hdr->ramdisk_size  = ramdisk_size & 0xffffffff;
 439         boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
 440         boot_params->ext_ramdisk_size  = (u64)ramdisk_size >> 32;
 441
 442         efi_stub_entry(handle, sys_table, boot_params);
 443         /* not reached */
 444
 445 fail2:
 446         efi_free(options_size, hdr->cmd_line_ptr);
 447 fail:
 448         efi_free(0x4000, (unsigned long)boot_params);
 449
 450         return status;
 451 }
 452
 453 static void add_e820ext(struct boot_params *params,
 454                         struct setup_data *e820ext, u32 nr_entries)
 455 {
 456         struct setup_data *data;
 457
 458         e820ext->type = SETUP_E820_EXT;
 459         e820ext->len  = nr_entries * sizeof(struct boot_e820_entry);
 460         e820ext->next = 0;
 461
 462         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 463
 464         while (data && data->next)
 465                 data = (struct setup_data *)(unsigned long)data->next;
 466
 467         if (data)
 468                 data->next = (unsigned long)e820ext;
 469         else
 470                 params->hdr.setup_data = (unsigned long)e820ext;
 471 }
 472
 473 static efi_status_t
 474 setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size)
 475 {
 476         struct boot_e820_entry *entry = params->e820_table;
 477         struct efi_info *efi = &params->efi_info;
 478         struct boot_e820_entry *prev = NULL;
 479         u32 nr_entries;
 480         u32 nr_desc;
 481         int i;
 482
 483         nr_entries = 0;
 484         nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
 485
 486         for (i = 0; i < nr_desc; i++) {
 487                 efi_memory_desc_t *d;
 488                 unsigned int e820_type = 0;
 489                 unsigned long m = efi->efi_memmap;
 490
 491 #ifdef CONFIG_X86_64
 492                 m |= (u64)efi->efi_memmap_hi << 32;
 493 #endif
 494
 495                 d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i);
 496                 switch (d->type) {
 497                 case EFI_RESERVED_TYPE:
 498                 case EFI_RUNTIME_SERVICES_CODE:
 499                 case EFI_RUNTIME_SERVICES_DATA:
 500                 case EFI_MEMORY_MAPPED_IO:
 501                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
 502                 case EFI_PAL_CODE:
 503                         e820_type = E820_TYPE_RESERVED;
 504                         break;
 505
 506                 case EFI_UNUSABLE_MEMORY:
 507                         e820_type = E820_TYPE_UNUSABLE;
 508                         break;
 509
 510                 case EFI_ACPI_RECLAIM_MEMORY:
 511                         e820_type = E820_TYPE_ACPI;
 512                         break;
 513
 514                 case EFI_LOADER_CODE:
 515                 case EFI_LOADER_DATA:
 516                 case EFI_BOOT_SERVICES_CODE:
 517                 case EFI_BOOT_SERVICES_DATA:
 518                 case EFI_CONVENTIONAL_MEMORY:
 519                         if (efi_soft_reserve_enabled() &&
 520                             (d->attribute & EFI_MEMORY_SP))
 521                                 e820_type = E820_TYPE_SOFT_RESERVED;
 522                         else
 523                                 e820_type = E820_TYPE_RAM;
 524                         break;
 525
 526                 case EFI_ACPI_MEMORY_NVS:
 527                         e820_type = E820_TYPE_NVS;
 528                         break;
 529
 530                 case EFI_PERSISTENT_MEMORY:
 531                         e820_type = E820_TYPE_PMEM;
 532                         break;
 533
 534                 default:
 535                         continue;
 536                 }
 537
 538                 /* Merge adjacent mappings */
 539                 if (prev && prev->type == e820_type &&
 540                     (prev->addr + prev->size) == d->phys_addr) {
 541                         prev->size += d->num_pages << 12;
 542                         continue;
 543                 }
 544
 545                 if (nr_entries == ARRAY_SIZE(params->e820_table)) {
 546                         u32 need = (nr_desc - i) * sizeof(struct e820_entry) +
 547                                    sizeof(struct setup_data);
 548
 549                         if (!e820ext || e820ext_size < need)
 550                                 return EFI_BUFFER_TOO_SMALL;
 551
 552                         /* boot_params map full, switch to e820 extended */
 553                         entry = (struct boot_e820_entry *)e820ext->data;
 554                 }
 555
 556                 entry->addr = d->phys_addr;
 557                 entry->size = d->num_pages << PAGE_SHIFT;
 558                 entry->type = e820_type;
 559                 prev = entry++;
 560                 nr_entries++;
 561         }
 562
 563         if (nr_entries > ARRAY_SIZE(params->e820_table)) {
 564                 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table);
 565
 566                 add_e820ext(params, e820ext, nr_e820ext);
 567                 nr_entries -= nr_e820ext;
 568         }
 569
 570         params->e820_entries = (u8)nr_entries;
 571
 572         return EFI_SUCCESS;
 573 }
 574
 575 static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
 576                                   u32 *e820ext_size)
 577 {
 578         efi_status_t status;
 579         unsigned long size;
 580
 581         size = sizeof(struct setup_data) +
 582                 sizeof(struct e820_entry) * nr_desc;
 583
 584         if (*e820ext) {
 585                 efi_bs_call(free_pool, *e820ext);
 586                 *e820ext = NULL;
 587                 *e820ext_size = 0;
 588         }
 589
 590         status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
 591                              (void **)e820ext);
 592         if (status == EFI_SUCCESS)
 593                 *e820ext_size = size;
 594
 595         return status;
 596 }
 597
 598 static efi_status_t allocate_e820(struct boot_params *params,
 599                                   struct setup_data **e820ext,
 600                                   u32 *e820ext_size)
 601 {
 602         unsigned long map_size, desc_size, buff_size;
 603         struct efi_boot_memmap boot_map;
 604         efi_memory_desc_t *map;
 605         efi_status_t status;
 606         __u32 nr_desc;
 607
 608         boot_map.map            = &map;
 609         boot_map.map_size       = &map_size;
 610         boot_map.desc_size      = &desc_size;
 611         boot_map.desc_ver       = NULL;
 612         boot_map.key_ptr        = NULL;
 613         boot_map.buff_size      = &buff_size;
 614
 615         status = efi_get_memory_map(&boot_map);
 616         if (status != EFI_SUCCESS)
 617                 return status;
 618
 619         nr_desc = buff_size / desc_size;
 620
 621         if (nr_desc > ARRAY_SIZE(params->e820_table)) {
 622                 u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table);
 623
 624                 status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size);
 625                 if (status != EFI_SUCCESS)
 626                         return status;
 627         }
 628
 629         return EFI_SUCCESS;
 630 }
 631
 632 struct exit_boot_struct {
 633         struct boot_params      *boot_params;
 634         struct efi_info         *efi;
 635 };
 636
 637 static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
 638                                    void *priv)
 639 {
 640         const char *signature;
 641         struct exit_boot_struct *p = priv;
 642
 643         signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE
 644                                    : EFI32_LOADER_SIGNATURE;
 645         memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));
 646
 647         p->efi->efi_systab              = (unsigned long)efi_system_table();
 648         p->efi->efi_memdesc_size        = *map->desc_size;
 649         p->efi->efi_memdesc_version     = *map->desc_ver;
 650         p->efi->efi_memmap              = (unsigned long)*map->map;
 651         p->efi->efi_memmap_size         = *map->map_size;
 652
 653 #ifdef CONFIG_X86_64
 654         p->efi->efi_systab_hi           = (unsigned long)efi_system_table() >> 32;
 655         p->efi->efi_memmap_hi           = (unsigned long)*map->map >> 32;
 656 #endif
 657
 658         return EFI_SUCCESS;
 659 }
 660
 661 static efi_status_t exit_boot(struct boot_params *boot_params, void *handle)
 662 {
 663         unsigned long map_sz, key, desc_size, buff_size;
 664         efi_memory_desc_t *mem_map;
 665         struct setup_data *e820ext = NULL;
 666         __u32 e820ext_size = 0;
 667         efi_status_t status;
 668         __u32 desc_version;
 669         struct efi_boot_memmap map;
 670         struct exit_boot_struct priv;
 671
 672         map.map                 = &mem_map;
 673         map.map_size            = &map_sz;
 674         map.desc_size           = &desc_size;
 675         map.desc_ver            = &desc_version;
 676         map.key_ptr             = &key;
 677         map.buff_size           = &buff_size;
 678         priv.boot_params        = boot_params;
 679         priv.efi                = &boot_params->efi_info;
 680
 681         status = allocate_e820(boot_params, &e820ext, &e820ext_size);
 682         if (status != EFI_SUCCESS)
 683                 return status;
 684
 685         /* Might as well exit boot services now */
 686         status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func);
 687         if (status != EFI_SUCCESS)
 688                 return status;
 689
 690         /* Historic? */
 691         boot_params->alt_mem_k  = 32 * 1024;
 692
 693         status = setup_e820(boot_params, e820ext, e820ext_size);
 694         if (status != EFI_SUCCESS)
 695                 return status;
 696
 697         return EFI_SUCCESS;
 698 }
 699
 700 /*
 701  * On success we return a pointer to a boot_params structure, and NULL
 702  * on failure.
 703  */
 704 struct boot_params *efi_main(efi_handle_t handle,
 705                              efi_system_table_t *sys_table_arg,
 706                              struct boot_params *boot_params)
 707 {
 708         unsigned long bzimage_addr = (unsigned long)startup_32;
 709         struct setup_header *hdr = &boot_params->hdr;
 710         efi_status_t status;
 711         unsigned long cmdline_paddr;
 712
 713         sys_table = sys_table_arg;
 714
 715         /* Check if we were booted by the EFI firmware */
 716         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 717                 goto fail;
 718
 719         /*
 720          * If the kernel isn't already loaded at the preferred load
 721          * address, relocate it.
 722          */
 723         if (bzimage_addr != hdr->pref_address) {
 724                 status = efi_relocate_kernel(&bzimage_addr,
 725                                              hdr->init_size, hdr->init_size,
 726                                              hdr->pref_address,
 727                                              hdr->kernel_alignment,
 728                                              LOAD_PHYSICAL_ADDR);
 729                 if (status != EFI_SUCCESS) {
 730                         efi_printk("efi_relocate_kernel() failed!\n");
 731                         goto fail;
 732                 }
 733         }
 734         hdr->code32_start = (u32)bzimage_addr;
 735
 736         /*
 737          * make_boot_params() may have been called before efi_main(), in which
 738          * case this is the second time we parse the cmdline. This is ok,
 739          * parsing the cmdline multiple times does not have side-effects.
 740          */
 741         cmdline_paddr = ((u64)hdr->cmd_line_ptr |
 742                          ((u64)boot_params->ext_cmd_line_ptr << 32));
 743         efi_parse_options((char *)cmdline_paddr);
 744
 745         /*
 746          * If the boot loader gave us a value for secure_boot then we use that,
 747          * otherwise we ask the BIOS.
 748          */
 749         if (boot_params->secure_boot == efi_secureboot_mode_unset)
 750                 boot_params->secure_boot = efi_get_secureboot();
 751
 752         /* Ask the firmware to clear memory on unclean shutdown */
 753         efi_enable_reset_attack_mitigation();
 754
 755         efi_random_get_seed();
 756
 757         efi_retrieve_tpm2_eventlog();
 758
 759         setup_graphics(boot_params);
 760
 761         setup_efi_pci(boot_params);
 762
 763         setup_quirks(boot_params);
 764
 765         status = exit_boot(boot_params, handle);
 766         if (status != EFI_SUCCESS) {
 767                 efi_printk("exit_boot() failed!\n");
 768                 goto fail;
 769         }
 770
 771         return boot_params;
 772 fail:
 773         efi_printk("efi_main() failed!\n");
 774
 775         for (;;)
 776                 asm("hlt");
 777 }